| Re:Sehe ich eigentlich keinen Bedarf für. |  |
>Eine Studie dazu wäre spannend, aber ganz abgesehen von der Gesundheitsfrage: In Gastgärten wird gegessen. Wenn daneben geraucht wird, stinkts. Brauch ich nicht. Und Du kommst dem ja nicht aus, außer Du verziehst Dich nach drinnen.
Es sind zwar nicht viele, aber es gibt ein paar Untersuchungen, die im wesentlichen bestätigen, was jeder mit Augen und Nase sich denken kann: Spätestens wenn man den Rauch riecht ist die Giftstoffbelastung auch erhöht. Und dadurch auch die Gesundheitsbeeinträchtigung.
"On terraces, the overall median nicotine concentration was 0.54 µg/m3 (IQR: 0.25–1.14 µg/m3), but it increased to 0.60 µg/m3 when a tobacco smell was perceived, 0.72 µg/m3 on closed terraces, 1.24 µg/m3 when there were >6 smokers, and 1.24 µg/m3 when someone smoked >20 min." [https://www.sciencedirect.com/science/article/pii/S0013935116301505]
" Outdoor tobacco smoke consists of brief plumes that sometimes exceed 1,000 micrograms, Klepeis added. "On the other hand, clean air typically contains less than 20 micrograms of PM2.5," he said. "Therefore, a person near an outdoor smoker might inhale a breath with 50 times more toxic material than in the surrounding unpolluted air."
However, the researchers found that air quality improved as they moved away from the smoker. "These results show what common sense would suggest—when you're within a few feet downwind of a smoker, you get exposed," Ott explained. "But likewise, when you go a little distance or stay upwind, the exposure goes way down. If there's just one smoker, and you can sit six feet away, you would have little problem. At the same time, if there are a lot of smokers nearby, you may be exposed to very high levels of secondhand smoke. So this thing that critics have been dismissing as trivial is not."" [https://news.stanford.edu/news/2007/may9/smoking-050907.html]
"Repace and Rupprecht (13 WCTOH, 2006 ) measured OTS [outdoor levels of tobacco smoke] respirable particle pollution in Five outdoor cafes and on city streets in downtown Helsinki. They found that air pollution levels in Helsinki outdoor cafes with many smokers during August 2003 were 5 to 20 times higher than on the sidewalks of busy streets polluted by bus, truck, and auto traffic."
"Repace (2005) found that cigarette smoke RSP concentrations decline approximately inversely with distance downwind from the point source, whereas cigarette smoke carcinogen concentrations decline approximately inversely as the square of the distance from source to receptor. The experiments showed that OTS smoke levels did not approach background levels either for fine particles or carcinogens until about 23 feet from the source."
[www.repace.com/pdf/OTS_FACT_SHEET.pdf]